But you may be surprised to learn that with a little bit of creativity and effort, you can squeeze in workouts every day. You may not be able to run 10 miles or take an hour-long kickboxing class each day, but it may be easier than you think to incorporate an effective 20-minute workout.

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Revisit your Childhood. Invest in a jump-rope. Sound like something for the kids? Well, it's more strenuous than you may remember from your days on the playground. Jumping rope is a great cardio workout. Start out with short reps and frequent breaks. Gradually increase the amount of time spent jumping. Jumping rope can be a lot of fun, and it's something that can be done inside or out, any time of the year.